Stenka25 One of the ground for this distinction between restrictive vs. ) Yes, that seems true: there seems to be only one perpendicular (he means 'vertical', I think) axis, hence any modification is non-restrictive. Stenka25 If I use 'that' without a comma instead of 'which' with comma, and make the non-restrictive pronoun the restrictive, is that sentence severely wrong?
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Stenka25 One of the ground for this distinction between restrictive vs. non-restrictive seems to be that the precedent of the former has an article 'an' in 'an axis' and the precedent of the latter has an indefinite article 'the' in 'the perpendicular axis'.(Am I right?)Yes, that seems true: there seems to be only one perpendicular (he means 'vertical', I thi